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Note 2 - Loss Per Share - Antidilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Total anti-dilutive securities (in shares) 4,957,944 6,080,206
Restricted Stock Units (RSUs) [Member]    
Total anti-dilutive securities (in shares) 1,985,611 3,042,873
Share-Based Payment Arrangement, Option [Member]    
Total anti-dilutive securities (in shares) 2,139,000 2,204,000
Warrant [Member]    
Total anti-dilutive securities (in shares) 833,333 833,333